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Abstract:

A dark field lighting testing device, for detecting a surface defect of an
object having mirror surfaces, includes a cavity, the interior surface of
which is made of a light-absorbing material; an opening arranged on a top
of the cavity; a tape body arranged on the interior surface of the
cavity; a plurality of lighting elements arranged on the tape body and
electrically connected to each other; and a plate body arranged right
above the opening of the cavity. During testing procedure, light emitted
from each lighting element is incident upon the surface of the tested
object, from which the diffusively reflected or refracted light forms an
image on the surface of the plate body, thus a defect on the surface of
the tested body and a position thereof being able to be detected.

Claims:

1. A dark field lighting testing device, including:a cavity, an interior
surface of which is a surrounding and light-absorbing surface, and on a
top of which an opening is arranged;a tape body arranged on the interior
surface of the cavity;a plurality of lighting elements arranged on the
tape body and electrically connected to each other; anda plate body
arranged right above the opening of the cavity.

2. The dark field lighting testing device according to claim 1, wherein
the lighting element is an LED.

3. The dark field lighting testing device according to claim 1, wherein
the light-absorbing surface is constructed by a color possessing of a
light-absorbing characteristic.

4. The dark field lighting testing device according to claim 1, wherein
the color is a black color.

5. The dark field lighting testing device according to claim 1, wherein
the light-absorbing surface is constructed by a cloth possessing of a
light-absorbing characteristic.

6. The dark field lighting testing device according to claim 1, wherein
the cloth is a black cloth.

7. The dark field lighting testing device according to claim 1, wherein
the tape body is a plurality of tape bodies, each which is shown as a
ring shape.

Description:

BACKGROUND OF THE INVENTION

[0001]1. Field of the Invention

[0002]The present invention generally relates to an optical device, in
particular, to a testing device having a dark field photograph for
detecting a surface defect of an object.

[0003]2. Description of Prior Art

[0004]At present, dark field lighting technology is comprehensively
applied to the testing procedure of an element or an object having a
structure of mirror surfaces, for example, to the defect detection of
surfaces of jewel, gem, and semiconductor element, etc. Essentially, a
dark field lighting technology is to apply a light source to generate a
light incident directly upon an object to be tested, through the
diffusively reflective or refractive characteristics thereof, the
diffusively reflected or refracted light forming an image, from which a
defect on the tested object may be detected.

[0005]As shown in FIG. 1, which is a dark field testing device commonly
seen, and the device includes: a cavity 10, the interior surfaces of
which are all made of light-absorbing materials; an opening 101 arranged
on the top of the cavity 10; a plate body 20 arranged in corresponding to
the plate body 20; a lighting element 30 arranged at the bottom of the
cavity 10; a plurality of light-guiding tubes 40 closely surrounding the
lighting elements 30 to guide the light from a light source toward an
object 50 to be tested; and, a platform 102, on which the tested object
is placed, and by which the light emitted from the lighting element 30 is
blocked, such that the light guided by the light-guiding tubes 40 are
directly incident upon the object 50 to be tested, which has the
characteristics of reflection or refraction to focus an image on the
surface of the plate body 20, whereby the optical image may be judged to
determine whether a defect exists on the surface of the tested object or
not.

[0006]However, in the prior detecting device, in which light-guiding tubes
40 are served as light-guiding paths and light sources of the dark field
lighting, the object 50 to be tested has to be placed directly on the
platform 102 with an artificially turning or rotating way to make the
light of the light-guiding tube 40 incident upon the object to be tested
from every aspect. Not only the testing efficiency is deteriorated, but
also it easily results too insufficient light source to focus into an
image through reflection and refraction, by applying the light-guiding
tubes 40 as light-guiding paths, thanks to an indirectly lighting manner,
so during testing judgment, this kind of uncertainty will influence the
testing accuracy and becomes a problem needed to be solved urgently by
those who are skilled in this art.

SUMMARY OF THE INVENTION

[0007]The invention is to provide a dark field lighting testing device
capable of adjusting incident angles of the light source of the dark
field by arranging a plurality of tape bodies possessing of a plurality
of lighting elements. During test, light emitted from the lighting
elements is directly incident upon an object to be tested from different
incident aspects. Then, the diffusively reflected and refracted light is
further focused into an image at the outside of a cavity, for
facilitating a quick test in detecting a defect on the surface of the
object to be tested.

[0008]The invention is mainly to provide a dark field lighting testing
device for detecting a surface defect of an object having mirror
surfaces, and the device includes: a cavity, the interior surface of
which is made of a light-absorbing material; an opening arranged on a top
of the cavity; a tape body arranged on the interior surface of the
cavity; a plurality of lighting elements arranged on tape body and
electrically connected to each other; and, a plate body arranged right
above the opening of the cavity. During testing procedure, light emitted
from each lighting element is incident upon the surface of the tested
object, from which diffusively reflected or refracted light forms an
image on the surface of the plate body. Thus, a defect on the surface of
the tested body and a position thereof can be detected.

BRIEF DESCRIPTION OF DRAWING

[0009]The features of the invention believed to be novel are set forth
with particularity in the appended claims. The invention itself, however,
may be best understood by reference to the following detailed description
of the invention, which describes a number of exemplary embodiments of
the invention, taken in conjunction with the accompanying drawings, in
which:

[0011]FIG. 2 is a structurally, explosively perspective view of the
invention;

[0012]FIG. 3 is an operationally sectional illustration of the invention;

[0013]FIG. 4 is a perspective illustration according to another embodiment
of the invention; and

[0014]FIG. 5 is a locally enlarging illustration of a light-absorbing face
according to another embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0015]In cooperation with attached drawings, the technical contents and
detailed description of the present invention are described thereinafter
according to several preferable embodiments, being not used to limit its
executing scope. Any equivalent variation and modification made according
to appended claims is all covered by the claims claimed by the present
invention.

[0016]Please refer to FIG. 2, which is a structurally, explosively
perspective view of the invention. As shown in this figure, the testing
device of the invention includes: a cavity 1, the interior surface of
which is a light-absorbing surface 11 and is constructed of black
material, which is a black color in this embodiment or a black cloth as
shown in FIG. 5; an opening 12, the position of which is right above the
cavity 1 in this embodiment; a tape body 2 arranged over the
light-absorbing surface 11 in the interior of the cavity 1; a plurality
of lighting elements 3, each which is arranged on the tape body 2 and is
an LED in this embodiment, and which are electrically connected to each
other; a plate body 4 arranged right above the opening 12 of the cavity 1
for blocking the light reflected from the interior of the cavity 1, in
the meantime, making the light reflected from the interior of the cavity
focus an image thereon.

[0017]Please refer to FIG. 3, which is an operationally sectional view of
the invention. As shown in this figure, the testing device according to
the present invention is applied for the testing of an object 5 having
mirror surface or curved surface. In addition, the object 5 to be tested
has a diffusively reflecting or refracting function, for example,
possessed by jewel or semiconductor element having mirror surface. During
testing operation, the object 5 to be tested is hanged in the interior of
the cavity 1. Then, power is supplied to the tape body 2 surrounding
closely to the object 5 to be tested in a way, such that light, emitted
from a plurality of lighting elements 3 arranged on the tape body 2, is
directly incident upon the surface of the object 5 to be tested. Since of
the possession of the characteristics of a light's reflection or
refraction, the object 5 to be tested reflects or refracts the incident
light diffusively, which is partially absorbed by the light-absorbing
face 11, and the rest is focused onto the plate body 4 arranged on the
opening 12 of the cavity to form a light image, according to which a
defect on the surface of the object 5 to be tested may be detected if it
do exist.

[0018]Please refer to FIG. 4, which a perspective illustration according
to another embodiment of the present invention. In this case, except as a
single tape body 2 arranged on the light-absorbing face 11 of the cavity
1 as described thereinbefore, the tape body 2 may also be designed as a
ring-shaped configuration as shown in FIG. 4, which shows a plurality of
ring-shaped tape bodies 2 interspaced on the light-absorbing face 11 of
the cavity 1, and the lighting elements 3 arranged at a same tape body 2
are electrically connected to each other. By controlling the illumination
of the lighting element 3 on different tape bodies 2, lights emitted from
the light sources of different aspects are incident upon the mirrored
faces of the object 5 to be tested, thereby a detection of defect on
surface of the tested object 5 being able to achieve.

[0019]However, the aforementioned description is only a preferable
embodiment according to the present invention, being not used to limit
the patent scope of the invention, so equivalently structural variation
made to the contents of the present invention, for example, description
and drawings, is all covered by the claims claimed thereinafter.